EP2239313A1 - Lubricating agent composition and mechanical member - Google Patents
Lubricating agent composition and mechanical member Download PDFInfo
- Publication number
- EP2239313A1 EP2239313A1 EP09704336A EP09704336A EP2239313A1 EP 2239313 A1 EP2239313 A1 EP 2239313A1 EP 09704336 A EP09704336 A EP 09704336A EP 09704336 A EP09704336 A EP 09704336A EP 2239313 A1 EP2239313 A1 EP 2239313A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- lubricant composition
- hydrogen
- rolling
- group
- salts
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000000203 mixture Substances 0.000 title claims abstract description 50
- 239000000314 lubricant Substances 0.000 title claims abstract description 46
- 239000001257 hydrogen Substances 0.000 claims abstract description 52
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 52
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 50
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 claims abstract description 36
- 239000000654 additive Substances 0.000 claims abstract description 31
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 28
- 239000010959 steel Substances 0.000 claims abstract description 28
- 238000005096 rolling process Methods 0.000 claims abstract description 27
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims abstract description 25
- 230000000996 additive effect Effects 0.000 claims abstract description 21
- 239000003112 inhibitor Substances 0.000 claims abstract description 19
- 239000002199 base oil Substances 0.000 claims abstract description 14
- 230000001050 lubricating effect Effects 0.000 claims abstract description 11
- 239000002562 thickening agent Substances 0.000 claims description 23
- 150000003839 salts Chemical class 0.000 claims description 22
- 239000011701 zinc Substances 0.000 claims description 12
- 125000003342 alkenyl group Chemical group 0.000 claims description 6
- 125000000217 alkyl group Chemical group 0.000 claims description 6
- HNNQYHFROJDYHQ-UHFFFAOYSA-N 3-(4-ethylcyclohexyl)propanoic acid 3-(3-ethylcyclopentyl)propanoic acid Chemical class CCC1CCC(CCC(O)=O)C1.CCC1CCC(CCC(O)=O)CC1 HNNQYHFROJDYHQ-UHFFFAOYSA-N 0.000 claims description 4
- RYYWUUFWQRZTIU-UHFFFAOYSA-N Thiophosphoric acid Chemical class OP(O)(S)=O RYYWUUFWQRZTIU-UHFFFAOYSA-N 0.000 claims description 4
- GNVMUORYQLCPJZ-UHFFFAOYSA-N carbamothioic s-acid Chemical class NC(S)=O GNVMUORYQLCPJZ-UHFFFAOYSA-N 0.000 claims description 4
- 150000003014 phosphoric acid esters Chemical class 0.000 claims description 4
- 229910052725 zinc Inorganic materials 0.000 claims description 4
- 238000009835 boiling Methods 0.000 claims description 3
- 239000003209 petroleum derivative Substances 0.000 claims description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 claims description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 2
- 229910052783 alkali metal Inorganic materials 0.000 claims description 2
- 150000001340 alkali metals Chemical class 0.000 claims description 2
- 229910052784 alkaline earth metal Inorganic materials 0.000 claims description 2
- 150000001342 alkaline earth metals Chemical class 0.000 claims description 2
- 125000005037 alkyl phenyl group Chemical group 0.000 claims description 2
- 125000004432 carbon atom Chemical group C* 0.000 claims description 2
- 150000001735 carboxylic acids Chemical class 0.000 claims 1
- 229910052751 metal Inorganic materials 0.000 abstract description 24
- 239000002184 metal Substances 0.000 abstract description 24
- 239000003921 oil Substances 0.000 abstract description 22
- 238000012360 testing method Methods 0.000 description 16
- 239000004519 grease Substances 0.000 description 15
- 230000000694 effects Effects 0.000 description 12
- 229920013639 polyalphaolefin Polymers 0.000 description 11
- 239000007769 metal material Substances 0.000 description 10
- 239000000463 material Substances 0.000 description 7
- 239000004202 carbamide Substances 0.000 description 6
- 230000002401 inhibitory effect Effects 0.000 description 6
- -1 polytetrafluoroethylene Polymers 0.000 description 6
- IKXFIBBKEARMLL-UHFFFAOYSA-N triphenoxy(sulfanylidene)-$l^{5}-phosphane Chemical compound C=1C=CC=CC=1OP(OC=1C=CC=CC=1)(=S)OC1=CC=CC=C1 IKXFIBBKEARMLL-UHFFFAOYSA-N 0.000 description 6
- 101100407037 Oryza sativa subsp. japonica PAO6 gene Proteins 0.000 description 5
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 5
- 239000011575 calcium Substances 0.000 description 5
- 150000002431 hydrogen Chemical class 0.000 description 5
- 239000010687 lubricating oil Substances 0.000 description 5
- 230000002265 prevention Effects 0.000 description 5
- 150000003871 sulfonates Chemical class 0.000 description 5
- XMKLTEGSALONPH-UHFFFAOYSA-N 1,2,4,5-tetrazinane-3,6-dione Chemical compound O=C1NNC(=O)NN1 XMKLTEGSALONPH-UHFFFAOYSA-N 0.000 description 4
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 4
- 238000005336 cracking Methods 0.000 description 4
- 230000008719 thickening Effects 0.000 description 4
- RIOQSEWOXXDEQQ-UHFFFAOYSA-N triphenylphosphine Chemical compound C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1 RIOQSEWOXXDEQQ-UHFFFAOYSA-N 0.000 description 4
- LSNNMFCWUKXFEE-UHFFFAOYSA-M Bisulfite Chemical compound OS([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-M 0.000 description 3
- 125000003118 aryl group Chemical group 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 230000003111 delayed effect Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- CJMZLCRLBNZJQR-UHFFFAOYSA-N ethyl 2-amino-4-(4-fluorophenyl)thiophene-3-carboxylate Chemical compound CCOC(=O)C1=C(N)SC=C1C1=CC=C(F)C=C1 CJMZLCRLBNZJQR-UHFFFAOYSA-N 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- 125000005609 naphthenate group Chemical group 0.000 description 3
- 239000000344 soap Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- YEVQZPWSVWZAOB-UHFFFAOYSA-N 2-(bromomethyl)-1-iodo-4-(trifluoromethyl)benzene Chemical compound FC(F)(F)C1=CC=C(I)C(CBr)=C1 YEVQZPWSVWZAOB-UHFFFAOYSA-N 0.000 description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- YSMRWXYRXBRSND-UHFFFAOYSA-N TOTP Chemical compound CC1=CC=CC=C1OP(=O)(OC=1C(=CC=CC=1)C)OC1=CC=CC=C1C YSMRWXYRXBRSND-UHFFFAOYSA-N 0.000 description 2
- GNVMUORYQLCPJZ-UHFFFAOYSA-M Thiocarbamate Chemical compound NC([S-])=O GNVMUORYQLCPJZ-UHFFFAOYSA-M 0.000 description 2
- 239000004480 active ingredient Substances 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 150000007942 carboxylates Chemical class 0.000 description 2
- 150000001732 carboxylic acid derivatives Chemical class 0.000 description 2
- 230000003197 catalytic effect Effects 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 150000002148 esters Chemical class 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000002480 mineral oil Substances 0.000 description 2
- 239000007800 oxidant agent Substances 0.000 description 2
- RZXMPPFPUUCRFN-UHFFFAOYSA-N p-toluidine Chemical compound CC1=CC=C(N)C=C1 RZXMPPFPUUCRFN-UHFFFAOYSA-N 0.000 description 2
- 238000002161 passivation Methods 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 239000004810 polytetrafluoroethylene Substances 0.000 description 2
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 150000003460 sulfonic acids Chemical class 0.000 description 2
- 239000013077 target material Substances 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- RAADJDWNEAXLBL-UHFFFAOYSA-N 1,2-di(nonyl)naphthalene Chemical compound C1=CC=CC2=C(CCCCCCCCC)C(CCCCCCCCC)=CC=C21 RAADJDWNEAXLBL-UHFFFAOYSA-N 0.000 description 1
- GIVMKUUIXYEXLH-UHFFFAOYSA-N 1,2-didecylnaphthalene Chemical compound C1=CC=CC2=C(CCCCCCCCCC)C(CCCCCCCCCC)=CC=C21 GIVMKUUIXYEXLH-UHFFFAOYSA-N 0.000 description 1
- WHMBAQLLOMUIGU-UHFFFAOYSA-N 1,2-dioctylnaphthalene Chemical compound C1=CC=CC2=C(CCCCCCCC)C(CCCCCCCC)=CC=C21 WHMBAQLLOMUIGU-UHFFFAOYSA-N 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- PIICEJLVQHRZGT-UHFFFAOYSA-N Ethylenediamine Chemical compound NCCN PIICEJLVQHRZGT-UHFFFAOYSA-N 0.000 description 1
- 239000005069 Extreme pressure additive Substances 0.000 description 1
- AFBPFSWMIHJQDM-UHFFFAOYSA-N N-methyl-N-phenylamine Natural products CNC1=CC=CC=C1 AFBPFSWMIHJQDM-UHFFFAOYSA-N 0.000 description 1
- QCJQWJKKTGJDCM-UHFFFAOYSA-N [P].[S] Chemical compound [P].[S] QCJQWJKKTGJDCM-UHFFFAOYSA-N 0.000 description 1
- BWLKKFSDKDJGDZ-UHFFFAOYSA-N [isocyanato(phenyl)methyl]benzene Chemical compound C=1C=CC=CC=1C(N=C=O)C1=CC=CC=C1 BWLKKFSDKDJGDZ-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 150000004996 alkyl benzenes Chemical class 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 239000007866 anti-wear additive Substances 0.000 description 1
- 229910052787 antimony Inorganic materials 0.000 description 1
- 150000004945 aromatic hydrocarbons Chemical class 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- 238000004517 catalytic hydrocracking Methods 0.000 description 1
- 238000010349 cathodic reaction Methods 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 150000005690 diesters Chemical class 0.000 description 1
- USIUVYZYUHIAEV-UHFFFAOYSA-N diphenyl ether Chemical compound C=1C=CC=CC=1OC1=CC=CC=C1 USIUVYZYUHIAEV-UHFFFAOYSA-N 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 229920002313 fluoropolymer Polymers 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 238000005984 hydrogenation reaction Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 239000000543 intermediate Substances 0.000 description 1
- 229910052745 lead Inorganic materials 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920001083 polybutene Polymers 0.000 description 1
- 229920005862 polyol Polymers 0.000 description 1
- 229920001451 polypropylene glycol Polymers 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 229920002545 silicone oil Polymers 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 150000008054 sulfonate salts Chemical class 0.000 description 1
- 238000006277 sulfonation reaction Methods 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 150000003558 thiocarbamic acid derivatives Chemical class 0.000 description 1
- RYYWUUFWQRZTIU-UHFFFAOYSA-K thiophosphate Chemical compound [O-]P([O-])([O-])=S RYYWUUFWQRZTIU-UHFFFAOYSA-K 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M169/00—Lubricating compositions characterised by containing as components a mixture of at least two types of ingredient selected from base-materials, thickeners or additives, covered by the preceding groups, each of these compounds being essential
- C10M169/04—Mixtures of base-materials and additives
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/30—Parts of ball or roller bearings
- F16C33/66—Special parts or details in view of lubrication
- F16C33/6637—Special parts or details in view of lubrication with liquid lubricant
- F16C33/6688—Lubricant compositions or properties, e.g. viscosity
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2205/00—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
- C10M2205/02—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers
- C10M2205/0206—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers used as base material
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
- C10M2207/10—Carboxylix acids; Neutral salts thereof
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
- C10M2207/10—Carboxylix acids; Neutral salts thereof
- C10M2207/16—Naphthenic acids
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
- C10M2215/006—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions used as thickening agents
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
- C10M2215/10—Amides of carbonic or haloformic acids
- C10M2215/102—Ureas; Semicarbazides; Allophanates
- C10M2215/1026—Ureas; Semicarbazides; Allophanates used as thickening material
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2219/00—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions
- C10M2219/04—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions containing sulfur-to-oxygen bonds, i.e. sulfones, sulfoxides
- C10M2219/044—Sulfonic acids, Derivatives thereof, e.g. neutral salts
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2219/00—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions
- C10M2219/06—Thio-acids; Thiocyanates; Derivatives thereof
- C10M2219/062—Thio-acids; Thiocyanates; Derivatives thereof having carbon-to-sulfur double bonds
- C10M2219/066—Thiocarbamic type compounds
- C10M2219/068—Thiocarbamate metal salts
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2223/00—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions
- C10M2223/02—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions having no phosphorus-to-carbon bonds
- C10M2223/04—Phosphate esters
- C10M2223/045—Metal containing thio derivatives
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2223/00—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions
- C10M2223/02—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions having no phosphorus-to-carbon bonds
- C10M2223/04—Phosphate esters
- C10M2223/047—Thioderivatives not containing metallic elements
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
- C10N2030/06—Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
- C10N2030/12—Inhibition of corrosion, e.g. anti-rust agents or anti-corrosives
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2040/00—Specified use or application for which the lubricating composition is intended
- C10N2040/02—Bearings
Definitions
- the present invention relates to a lubricant composition for suitably lubricating steel mechanical members which provide rolling or rolling-sliding motion, and a mechanical member containing the lubricant composition. More particularly, the invention relates to a lubricant composition that can favorably work to prevent the members used in an atmosphere of hydrogen from causing flaking by hydrogen embrittlement, the above-mentioned members including, for example, rolling element bearings, gear wheels, ball threads, linear guides, linear motion guide bearings, a variety of gears, cams or joints and the like used in the fuel-cell related equipment, oil refining related equipment including apparatus designed for hydrocracking, hydrodesulfurization and hydrotreatment of heavy oil, hydrogenation related equipment for chemicals and the like, nuclear electric power generation-related equipment, hydrogen fueling stations and other hydrogen filling infrastructure for fuel cell-powered vehicles, and the like.
- the above-mentioned members including, for example, rolling element bearings, gear wheels, ball threads, linear guides, linear motion guide bearings, a variety of gears,
- the problem of hydrogen embrittlement of metal materials such as steel and the like, i.e., the process where the metal materials lose their ductility following the diffusion of hydrogen into the metal materials has been especially discussed recent years.
- the progress of hydrogen embrittlement will bring about serious results, i.e., cracking of the metal material and the like.
- the cracking of metal material by the hydrogen embrittlement is called delayed fracture phenomenon.
- the delayed fracture is also known as static fatigue where a high-strength member placed under the application of static tensile stress suddenly causes brittle fracture after a length of time.
- the cause of the delayed fracture in the high-strength member is considered to be hydrogen introduced into the material in the course of manufacturing process thereof or during the operational use thereof.
- Hydrogen is more likely to diffuse into a metal material of which the lattice vacancy density becomes higher by the plastic deformation, so that hydrogen is accumulated around the portions where the tensile stress is concentrated, that is, the screwed portions, corrosion pits and the like, to induce the fracture, that is, the so-called hydrogen embrittlement of the metal material.
- hydrogen embrittlement of the metal material Generally, hydrogen occluded in metal, notably in steel, has little effect on the yield strength and tensile strength of the metal, but tends to cause the ductility and toughness of the metal to deteriorate. Accordingly, great attention should be given to hydrogen, especially in high-strength steel. This is because the material for the metal member becomes more susceptible to hydrogen embrittlement as the strength of the metal member is made higher.
- a phenyl ether synthetic oil as the base oil for grease is proposed to prevent the generation of hydrogen caused by decomposition of the lubricant (e.g., JP 3-250094 A ).
- a particular thickener, an oxidizer for passivation and an organic sulfonate are added to a particular base oil (e.g., JP 5-263091 A ).
- azo compounds capable of absorbing hydrogen be added to the grease used for metal materials required to have tribological properties and for a variety of members, in particular, to the grease to be filled into the bearing used at a portion subject to entry of water (e.g., JP 2002-130301 A ).
- a grease composition is proposed where a fluorinated polymer oil, polytetrafluoroethylene as the thickener and an electroconductive material are added to a base oil (e.g., JP 2002-250351 A ).
- journal bearing sliding bearing
- piston screw, rope, chain and the like.
- the fatigue life used herein is a useful life of metal determined by rolling fatigue.
- thickening of the lubricating oil film is a conventional means.
- JP 2007-262300 A describes that the addition of rust inhibitor such as organic sulfonates, carboxylates, thiocarbamates and the like can effectively prevent the flaking from occurring in an atmosphere of hydrogen. It is believed that a coating of the rust inhibitor can block the entrance of hydrogen.
- rust inhibitor such as organic sulfonates, carboxylates, thiocarbamates and the like can effectively prevent the flaking from occurring in an atmosphere of hydrogen. It is believed that a coating of the rust inhibitor can block the entrance of hydrogen.
- An object of the invention is to provide a lubricant composition suitably lubricating steel mechanical members operated by a rolling or rolling-sliding motion.
- Another object of the invention is to provide a lubricant composition for mechanical members which are operated by a rolling motion or rolling-sliding motion in an atmosphere of hydrogen and have a lubricated steel portion.
- a further object of the invention is to provide a lubricant composition for mechanical members including rolling element bearings and the like used in the automobile electrical equipment and the auxiliaries thereof.
- a still another object of the invention is to provide a mechanical member containing the above-mentioned lubricant composition.
- the present invention provides a lubricant composition and a mechanical member shown below.
- the present invention can extend the fatigue life determined by metal fatigue and the fatigue life determined by hydrogen embrittlement, without increasing the thickness of the oil film of lubricant composition.
- the lubricant composition of the invention can increase the fatigue life of steel determined by metal fatigue, so that the lubricant composition can be suitably used for lubricating the mechanical members operated in a rolling motion or a rolling-sliding motion, for example, rolling element bearings and the like, used in the automobile electrical equipment and the auxiliaries thereof.
- the lubricant composition of the invention can extend the fatigue life of steel determined by hydrogen embrittlement, so that the lubricant composition can be suitably used for lubricating the rolling element bearings, gear wheels, ball threads, linear guides, linear motion guide bearings, cams, joints and the like used in an atmosphere of hydrogen.
- the inventors of this invention have previously conducted a rolling four ball test to find a lubricant composition capable of extending the fatigue life of steel in an atmosphere of hydrogen. In the test, however, a base oil with high viscosity was used, so that the resultant oil film became thick. In other words, the test analysis was made under the conditions that the metal surfaces to be lubricated are not in a direct contact with each other, with the oil film formed between those metal surfaces.
- the organic sulfonate rust inhibitor used in the lubricant composition of the invention is a salt of sulfonic acid having an organic lipophilic group.
- the sulfonic acid includes petroleum sulfonic acids obtainable by sulfonation of the aromatic hydrocarbon ingredient in lube stock and the high boiling petroleum distillate, synthetic sulfonic acids such as dinonyl naphthalene sulfonic acid, heavy alkylbenzene sulfonic acid, and the like.
- the salt includes metal salts with Ca, Na, Ba, Li, Zn, Pb, Mg and the like, and amine salts with ammonia, ethylenediamine and the like.
- organic sulfonate highly basic sulfonates where fine particles of calcium carbonate, calcium hydroxide or the like are dispersed to produce the effect of acid neutralization are commercially available, which are usable as the organic sulfonate salt rust inhibitor in the invention.
- organic sulfonates represented by formula (I) are preferable.
- the organic sulfonate rust inhibitor used in the invention may be either a neutral, basic, or highly basic organic sulfonate.
- the base number of the organic sulfonate is not particularly limited, but preferably 0 to 1000 mg KOH/g.
- organic sulfonate examples include dioctyl naphthalene sulfonate, dinonyl naphthalene sulfonate, didecyl naphthalene sulfonate, petroleum sulfonate, highly basic alkylbenzene sulfonate and the like.
- the organic sulfonate is commonly used as a major additive for the so-called rust inhibiting oil designed for temporary rust prevention of metal products and the like in the storage, transportation, and maintenance thereof. Similar to other rust inhibitors, the organic sulfonate is generally used for the lubricating oil and grease which are strongly required to have rust prevention effect. Basically, the organic sulfonate has neither extreme pressure effect nor friction reduction effect, so that the organic sulfonate is not an additive for improving the lubricating properties.
- the content of the organic sulfonate may be preferably 0.1 to 10 mass%, and more preferably 0.2 to 5 mass%, in the lubricant composition of the invention.
- the content of additive used herein indicates the amount of active ingredient contained in the target material.
- the load carrying additive includes salts of thiocarbamic acid, salts of thiophosphoric acid, salts of naphthenic acid, organic phosphoric acid esters, salts of carboxylic acid and the like.
- the salt includes metal salts with Mo, Zn, Bi, Ni, Cu, Ag, Sb and the like.
- salts of thiocarbamic acid and salts of thiophosphoric acid are widely used as the extreme pressure agent or antiwear additive for the lubricating oil.
- the organic phosphoric acid esters are conventionally well known as the wear prevention agent and widely used in the lubricating oil. Representative examples include tricresyl phosphate (TCP), triphenyl phosphine (TPP), trioctyl phosphate (TOP), triphenyl phosphorothionate (TPPT) and the like.
- the content of the load carrying additive may be preferably 0.1 to 10 mass%, and more preferably 0.2 to 5 mass% in the lubricant composition of the invention.
- the content of additive used herein indicates the amount of active ingredient contained in the target material.
- the lubricant composition of the invention may be formed into a grease composition by the addition of a thickener.
- the thickener used for preparation of the grease composition of the invention is not particularly limited.
- soap type thickeners including Li soap and composite Li soap, urea-based thickeners such as diurea, inorganic thickeners such as organic clay and silica, organic thickeners such as PTFE and the like can be used.
- urea-based thickeners are preferably used.
- the grease composition containing a urea-based thickener is frequently used for the application where anti-flaking properties are desired. That may be because the rolling contact surface can be protected by the urea compound. Accordingly, when the urea-based thickener is used in the invention, the effect of extending the fatigue life is more significantly exhibited. Further, the urea-based thickener is less disadvantageous, relatively inexpensive, and highly practical when compared with other thickeners.
- the content of the thickener in the grease composition of the invention may vary depending on the kind of thickener.
- the grease composition of the invention may preferably have a consistency of 200 to 400. Namely, the content of the thickener is considered to be the amount necessary to obtain the above-mentioned consistency.
- the thickener may be generally contained in an amount of 3 to 30 mass%, preferably 5 to 25 mass%.
- the base oil used in the lubricant composition of the invention is not particularly limited.
- any base oils including mineral oils are usable.
- ester based synthetic oils such as diester and polyol ester
- synthetic hydrocarbon oils such as poly ⁇ -olefin and polybutene
- ether based synthetic oils such as alkyldiphenyl ether and polypropylene glycol
- synthetic oils such as silicone oils, fluorinated oils and the like can be employed.
- the lubricant composition of the invention may further comprise various additives when necessary.
- additives include an oxidation inhibitor, metal corrosion inhibitor, oilness improver, any other anti-wear agent, solid lubricant, any other rust inhibitor than organic sulfonates, and the like.
- the major role of the rust inhibitor is to form a close adsorption film on the metal surface to prevent the contact of the metal surface with water and oxygen, thereby inhibiting the metal from rusting.
- the organic sulfonate has a polar group (-SO 3 - ) with a strong effect of rust prevention, and is considered to form a harder film than other rust inhibitors, for example, ester (alcohol)-based and amine-based compounds.
- a solid film of load carrying additive is formed over the rust inhibiting film to protect the rust inhibiting film in the area to be lubricated as mentioned above, so that the diffusion of hydrogen into steel can be inhibited to prevent the flaking of steel even though the oil film is thin.
- the predetermined amounts of additives were added to the base oil to prepare lubricant compositions.
- Three steel balls with a diameter of 15 mm designed for bearing were disposed in a container with an inner diameter of 40 mm and a height of 14 mm, which was filled with about 20 ml of a test oil.
- one rotary steel ball (5/8-in) for bearing was placed, and then the container was set in a test machine.
- the four balls were rotated for 4 hours for shakedown under application of a load, and then hydrogen gas was introduced into the test oil.
- the lower three balls revolved as each rotating on its axis.
- the balls were made to rotate continuously until the flaking took place.
- the flaking occurred at a point between the balls having the highest contact pressure.
- the fatigue life was expressed as the total number of contact times with the upper rotary ball counted when the flaking took place.
- the above-mentioned procedure was repeated five times to determine the life (L50) in terms of the average number of contact times at which 50% of the balls reached the end of fatigue life.
- the lubricant compositions prepared in Examples 1 to 16 according to the invention containing both the organic sulfonate rust inhibitor and the load carrying additive showed remarkably long fatigue life as expressed by 20 x 10 6 times or more.
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Abstract
Description
- The present invention relates to a lubricant composition for suitably lubricating steel mechanical members which provide rolling or rolling-sliding motion, and a mechanical member containing the lubricant composition. More particularly, the invention relates to a lubricant composition that can favorably work to prevent the members used in an atmosphere of hydrogen from causing flaking by hydrogen embrittlement, the above-mentioned members including, for example, rolling element bearings, gear wheels, ball threads, linear guides, linear motion guide bearings, a variety of gears, cams or joints and the like used in the fuel-cell related equipment, oil refining related equipment including apparatus designed for hydrocracking, hydrodesulfurization and hydrotreatment of heavy oil, hydrogenation related equipment for chemicals and the like, nuclear electric power generation-related equipment, hydrogen fueling stations and other hydrogen filling infrastructure for fuel cell-powered vehicles, and the like.
- Recent advances in the technology using hydrogen as the energy source have become striking, for example, as in the widespread use of fuel cell. In this field, various improvements in the materials themselves of storage containers, pipes and the like to handle hydrogen have been contemplated, as shown in the technology to store hydrogen under high pressure. The adverse effect of hydrogen on the metal materials has been long studied in the research of corrosion. For example, hydrogen gas generated by cathodic reaction in etching solutions induces cracking as a result of stress concentration. Further, hydrogen is held by adsorption on the surface of the intermediate and precipitate, or hydrogen diffuses into the material through the portions around flaws and is accumulated there to make the portions brittle, to advance the cracking in the material and then result in fracture. The problem of hydrogen embrittlement of metal materials such as steel and the like, i.e., the process where the metal materials lose their ductility following the diffusion of hydrogen into the metal materials has been especially discussed recent years. The progress of hydrogen embrittlement will bring about serious results, i.e., cracking of the metal material and the like. The cracking of metal material by the hydrogen embrittlement is called delayed fracture phenomenon. The delayed fracture is also known as static fatigue where a high-strength member placed under the application of static tensile stress suddenly causes brittle fracture after a length of time. The cause of the delayed fracture in the high-strength member is considered to be hydrogen introduced into the material in the course of manufacturing process thereof or during the operational use thereof. Hydrogen is more likely to diffuse into a metal material of which the lattice vacancy density becomes higher by the plastic deformation, so that hydrogen is accumulated around the portions where the tensile stress is concentrated, that is, the screwed portions, corrosion pits and the like, to induce the fracture, that is, the so-called hydrogen embrittlement of the metal material. Generally, hydrogen occluded in metal, notably in steel, has little effect on the yield strength and tensile strength of the metal, but tends to cause the ductility and toughness of the metal to deteriorate. Accordingly, great attention should be given to hydrogen, especially in high-strength steel. This is because the material for the metal member becomes more susceptible to hydrogen embrittlement as the strength of the metal member is made higher.
- There are few researches or studies about hydrogen embrittlement discussed from the viewpoint of tribology. The technology of fuel cell or the like where hydrogen is used as the energy, however, always involves transfer of hydrogen, and mechanical members, for example, relating to travelling are also accompanied by transfer of hydrogen as a matter of course. The compressor, which is one of the typical examples has rolling element bearings, sliding bearings and the like as the tribological elements. Some measures are essential to protect those mechanical members and the metal materials therefor from hydrogen embrittlement, but sufficient countermeasures are not taken at the present stage.
- In the field of automobile electrical equipment or auxiliaries thereof, hydrogen embrittlement in the rolling element bearing has become a problem, and this problem has been handled by improving the properties of grease to be employed. For example, addition of an oxidizer for passivation to the grease is proposed in order to inhibit a catalytic action of the metal surface newly appearing as a result of the wear (e.g.,
JP 3-210394 A JP 3-250094 A JP 5-263091 A JP 2002-130301 A JP 2002-250351 A - There are some mechanical members operated by a sliding motion, not by the rolling motion, and the life of those members is limited by wear and seizure instead of flaking. The representative examples of those mechanical members include journal bearing (sliding bearing), piston, screw, rope, chain and the like.
- The fatigue life used herein is a useful life of metal determined by rolling fatigue. To use the mechanical members over a period of the above-mentioned fatigue life, thickening of the lubricating oil film is a conventional means.
- However, the cause of the flaking occurring in an atmosphere of hydrogen is considered to be hydrogen diffusing into steel to lower the mechanical strength of the steel material (Endo, Dong, Imai, Yamamoto "Study on Rolling Contact Fatigue in Hydrogen Atmosphere" Journal of Japanese Society of Tribologists Vol. 49, No. 10). In light of this, the flaking cannot be prevented only by thickening the lubricating oil film.
-
JP 2007-262300 A - An object of the invention is to provide a lubricant composition suitably lubricating steel mechanical members operated by a rolling or rolling-sliding motion.
- Another object of the invention is to provide a lubricant composition for mechanical members which are operated by a rolling motion or rolling-sliding motion in an atmosphere of hydrogen and have a lubricated steel portion.
- A further object of the invention is to provide a lubricant composition for mechanical members including rolling element bearings and the like used in the automobile electrical equipment and the auxiliaries thereof.
- A still another object of the invention is to provide a mechanical member containing the above-mentioned lubricant composition.
- The present invention provides a lubricant composition and a mechanical member shown below.
- (1) A lubricant composition for use in lubricating steel mechanical members operated by a rolling motion or rolling-sliding motion, comprising a base oil and additives, wherein the additives include an organic sulfonate rust inhibitor and a load carrying additive.
- (2) The lubricant composition as described in (1), wherein the load carrying additive is at least one selected from the group consisting of salts of thiocarbamic acid, salts of thiophosphoric acid, salts of naphthenic acid, salts of carboxylic acid, and organic phosphoric acid esters.
- (3) The lubricant composition as described in (1) or (2), wherein the organic sulfonate rust inhibitor is represented by the following formula (I):
[R1-SO3]n1M1 (I)
wherein R1 is an alkyl group, alkenyl group, alkylnaphthyl group, dialkylnaphthyl group, alkylphenyl group or a residue of high-boiling petroleum distillate, where the alkyl or alkenyl is a straight-chain or branched alkyl or alkenyl group having 2 to 22 carbon atoms; M1 is an alkali metal, alkaline earth metal, zinc or ammonium ion; and n1 indicates the valence of M1. - (4) The lubricant composition as described in any one of (1) to (3), further comprising a thickener.
- (5) The lubricant composition as described in any one of (1) to (4), wherein the mechanical member is a rolling element bearing, gear wheel, ball thread, linear guide, linear motion guide bearing, cam or joint which is operated in an atmosphere of hydrogen.
- (6) The lubricant composition as described in any one of (1) to (4), wherein the mechanical member is a rolling element bearing for use in the automobile electrical equipment or the auxiliaries thereof.
- (7) A mechanical member containing the lubricant composition as described in any one of (1) to (6) mentioned above.
- The present invention can extend the fatigue life determined by metal fatigue and the fatigue life determined by hydrogen embrittlement, without increasing the thickness of the oil film of lubricant composition.
- The lubricant composition of the invention can increase the fatigue life of steel determined by metal fatigue, so that the lubricant composition can be suitably used for lubricating the mechanical members operated in a rolling motion or a rolling-sliding motion, for example, rolling element bearings and the like, used in the automobile electrical equipment and the auxiliaries thereof.
- The lubricant composition of the invention can extend the fatigue life of steel determined by hydrogen embrittlement, so that the lubricant composition can be suitably used for lubricating the rolling element bearings, gear wheels, ball threads, linear guides, linear motion guide bearings, cams, joints and the like used in an atmosphere of hydrogen.
- The inventors of this invention have previously conducted a rolling four ball test to find a lubricant composition capable of extending the fatigue life of steel in an atmosphere of hydrogen. In the test, however, a base oil with high viscosity was used, so that the resultant oil film became thick. In other words, the test analysis was made under the conditions that the metal surfaces to be lubricated are not in a direct contact with each other, with the oil film formed between those metal surfaces.
- When consideration is given to the operating conditions of steel mechanical members while in practical use, those members are often operated under the conditions that the steel surfaces to be lubricated directly come in contact with each other because the oil film is relatively thin.
- In light of the above, the four ball test was then conducted in an atmosphere of hydrogen under the conditions where the oil film was thin enough to bring the surfaces to be lubricated into a direct contact with each other, to evaluate the lubricating properties. The test demonstrated that the fatigue life of steel determined by metal fatigue cannot be satisfactorily extended only by the addition of an organic sulfonate. As a result of further analysis, it has been found that when a load carrying additive is contained in the lubricant composition, in addition to the organic sulfonate, the fatigue life can be extended even though the lubricating conditions become severer. The invention has been thus accomplished based on the above-mentioned findings.
- The organic sulfonate rust inhibitor used in the lubricant composition of the invention is a salt of sulfonic acid having an organic lipophilic group. The sulfonic acid includes petroleum sulfonic acids obtainable by sulfonation of the aromatic hydrocarbon ingredient in lube stock and the high boiling petroleum distillate, synthetic sulfonic acids such as dinonyl naphthalene sulfonic acid, heavy alkylbenzene sulfonic acid, and the like. The salt includes metal salts with Ca, Na, Ba, Li, Zn, Pb, Mg and the like, and amine salts with ammonia, ethylenediamine and the like.
- As one example of the organic sulfonate, highly basic sulfonates where fine particles of calcium carbonate, calcium hydroxide or the like are dispersed to produce the effect of acid neutralization are commercially available, which are usable as the organic sulfonate salt rust inhibitor in the invention.
- In particular, the organic sulfonates represented by formula (I) are preferable.
- The organic sulfonate rust inhibitor used in the invention may be either a neutral, basic, or highly basic organic sulfonate. In light of this, the base number of the organic sulfonate is not particularly limited, but preferably 0 to 1000 mg KOH/g.
- Preferable specific examples of the organic sulfonate include dioctyl naphthalene sulfonate, dinonyl naphthalene sulfonate, didecyl naphthalene sulfonate, petroleum sulfonate, highly basic alkylbenzene sulfonate and the like.
- The organic sulfonate is commonly used as a major additive for the so-called rust inhibiting oil designed for temporary rust prevention of metal products and the like in the storage, transportation, and maintenance thereof. Similar to other rust inhibitors, the organic sulfonate is generally used for the lubricating oil and grease which are strongly required to have rust prevention effect. Basically, the organic sulfonate has neither extreme pressure effect nor friction reduction effect, so that the organic sulfonate is not an additive for improving the lubricating properties.
- The content of the organic sulfonate may be preferably 0.1 to 10 mass%, and more preferably 0.2 to 5 mass%, in the lubricant composition of the invention. The content of additive used herein indicates the amount of active ingredient contained in the target material.
- The load carrying additive includes salts of thiocarbamic acid, salts of thiophosphoric acid, salts of naphthenic acid, organic phosphoric acid esters, salts of carboxylic acid and the like. The salt includes metal salts with Mo, Zn, Bi, Ni, Cu, Ag, Sb and the like. In particular, salts of thiocarbamic acid and salts of thiophosphoric acid are widely used as the extreme pressure agent or antiwear additive for the lubricating oil. The organic phosphoric acid esters are conventionally well known as the wear prevention agent and widely used in the lubricating oil. Representative examples include tricresyl phosphate (TCP), triphenyl phosphine (TPP), trioctyl phosphate (TOP), triphenyl phosphorothionate (TPPT) and the like.
- The content of the load carrying additive may be preferably 0.1 to 10 mass%, and more preferably 0.2 to 5 mass% in the lubricant composition of the invention. The content of additive used herein indicates the amount of active ingredient contained in the target material.
- Conventionally, some references describe that organic sulfonates not only have no effect on the prevention of flaking, but also adversely affect the rolling element bearings (for example,
JP 2004-125165 A - The lubricant composition of the invention may be formed into a grease composition by the addition of a thickener.
- The thickener used for preparation of the grease composition of the invention is not particularly limited. Preferably, soap type thickeners including Li soap and composite Li soap, urea-based thickeners such as diurea, inorganic thickeners such as organic clay and silica, organic thickeners such as PTFE and the like can be used. In particular, urea-based thickeners are preferably used.
- Recently, the grease composition containing a urea-based thickener is frequently used for the application where anti-flaking properties are desired. That may be because the rolling contact surface can be protected by the urea compound. Accordingly, when the urea-based thickener is used in the invention, the effect of extending the fatigue life is more significantly exhibited. Further, the urea-based thickener is less disadvantageous, relatively inexpensive, and highly practical when compared with other thickeners.
- The content of the thickener in the grease composition of the invention may vary depending on the kind of thickener. The grease composition of the invention may preferably have a consistency of 200 to 400. Namely, the content of the thickener is considered to be the amount necessary to obtain the above-mentioned consistency. In the grease composition of the invention the thickener may be generally contained in an amount of 3 to 30 mass%, preferably 5 to 25 mass%.
- The base oil used in the lubricant composition of the invention is not particularly limited. For example, any base oils including mineral oils are usable. In addition to the mineral oils, ester based synthetic oils such as diester and polyol ester, synthetic hydrocarbon oils such as poly α-olefin and polybutene, ether based synthetic oils such as alkyldiphenyl ether and polypropylene glycol, and a variety of synthetic oils such as silicone oils, fluorinated oils and the like can be employed.
- The lubricant composition of the invention may further comprise various additives when necessary. Examples of those additives include an oxidation inhibitor, metal corrosion inhibitor, oilness improver, any other anti-wear agent, solid lubricant, any other rust inhibitor than organic sulfonates, and the like.
- To prevent the flaking of steel under an atmosphere of hydrogen, it is required that the steel surface be protected with a close and hard film. For this purpose, formation of a rust inhibiting film by the rust inhibitor such as an organic sulfonate or carboxylate is effective (
JP 2007-262300 A - The mechanism of improvement in the metal fatigue life by the combined use of the organic sulfonate and the extreme pressure additive according to the invention still remains mostly unknown. The inventors of the invention inferred as follows.
- The major role of the rust inhibitor is to form a close adsorption film on the metal surface to prevent the contact of the metal surface with water and oxygen, thereby inhibiting the metal from rusting. In particular, the organic sulfonate has a polar group (-SO3 -) with a strong effect of rust prevention, and is considered to form a harder film than other rust inhibitors, for example, ester (alcohol)-based and amine-based compounds. However, when the lubricating conditions become severer (to such an extent that the oil film parameter A is 3 or less), for example, as a result of the increase of the surface roughness or the local contact pressure or the use of a lubricant with low viscosity, the rust inhibiting film is supposed to partially rupture, so that the contact of metal surfaces will inevitably occur. According to the invention, a solid film of load carrying additive is formed over the rust inhibiting film to protect the rust inhibiting film in the area to be lubricated as mentioned above, so that the diffusion of hydrogen into steel can be inhibited to prevent the flaking of steel even though the oil film is thin.
- The invention will now be explained more specifically with reference to the following examples.
- As shown in Tables 1 to 3, the predetermined amounts of additives were added to the base oil to prepare lubricant compositions.
- Three steel balls with a diameter of 15 mm designed for bearing were disposed in a container with an inner diameter of 40 mm and a height of 14 mm, which was filled with about 20 ml of a test oil. On the three steel balls, one rotary steel ball (5/8-in) for bearing was placed, and then the container was set in a test machine. The four balls were rotated for 4 hours for shakedown under application of a load, and then hydrogen gas was introduced into the test oil. The lower three balls revolved as each rotating on its axis. The balls were made to rotate continuously until the flaking took place. The flaking occurred at a point between the balls having the highest contact pressure. The fatigue life was expressed as the total number of contact times with the upper rotary ball counted when the flaking took place. The above-mentioned procedure was repeated five times to determine the life (L50) in terms of the average number of contact times at which 50% of the balls reached the end of fatigue life.
-
- Steel balls for test: 15-mm-dia. steel balls and 5/8-in steel ball for bearing
- Feed rate of hydrogen gas: 15 to 20 ml/min.
- Purity of hydrogen: 99.99%
- Load (W) for test: 100 kgf
- Maximum local contact pressure: 4.1 GPa
- Rotational speed (n): 1500 rpm
- The results are shown in Tables 1 to 3.
[Table 1] Examples 1 2 3 4 5 6 7 8 Base oil PAO6 PAO6 PAO6 PAO6 PAO6 PAO6 PAO6 PA06 Organic sulfonate (mass%) A Ca sulfonate 2 2 2 2 2 0.5 5 2 B Zn sulfonate - - - - - - - - Load carrying additive (mass%) C MoDTC 1 - - - - 5 - - D ZnDTC - 1 - - - - 0.5 1 E ZnDTP - - 1 - - - - - F TPPT - - - 1 - - - - G Zn naphthenate - - - - 1 - - - Thickener (mass%) H Aromatic diurea - - - - - - - 17 Rolling four-ball test Life L50 (x106 times) 20< 20< 20< 20< 20< 20< 20< 20< [Table 2] Examples 9 10 11 12 13 14 15 16 Base oil PAO6 PAO6 PAO6 PA06 PAO6 PAO6 PA06 PAO6 Organic sulfonate (mass%) A Ca sulfonate - - - - - - - - B Zn sulfonate 2 2 2 2 2 0.5 5 2 Load carrying additive (mass%) C MoDTC I - - - - - - - D ZnDTC - 1 - - - - - - E ZnDTP - - 1 - - 5 - 1 F TPPT - - - 1 - - 0.5 - G Zn naphthenate - - - - 1 - - - Thickener (mass%) H Aromatic diurea - - - - - - - 17 Rolling four-ball test Life L50 (x106 times) 20< 20< 20< 20< 20< 20< 20< 20< [Table 3] Comparative Examples 1 2 3 4 5 6 7 8 9 Base oil PAO 6 PAO 6 PAO 6 PAO 6 PAO 6 PAO 6 PAO 6 PAO 6 PAO 6 Organic sulfonate (mass%) A Ca sulfonate - 2 - - - - - 4 - B Zn sulfonate - - 2 - - 2 2 - - Load carrying additive (mass%) C MoDTC - - - - - - - - 2 D ZnDTC - - - 1 - - - - - E ZnDTP - - - - 1 - - - - F TPPT - - - - - - - - - G Zn naphthenate - - - - - - - - - Thickener (mass%) H Aromatic diurea - - - - - 17 17 - - Rolling four-ball test Life L50 (x106 times) 3.3 10.4 11.2 10.2 9.6 12.7 12.7 12.6 9.4 -
- PAO6: poly α-olefin (with a kinetic viscosity of 30.5 mm2/s at 40°C).
-
- A: Ca salt of dinonyl naphthalene sulfonic acid
- B: Zn salt of dinonyl naphthalene sulfonic acid
- C: Thiocarbamate (MoDTC)
- D: Thiocarbamate (ZnDTC)
- E: Thiophosphate (ZnDTP)
- F: Sulfur-phosphorus based extreme pressure agent (TPPT)
- G: Zn salt of naphthenic acid
-
- H: Diurea compound obtained from diphenylmethane isocyanate and p-toluidine
- The lubricant compositions prepared in Examples 1 to 16 according to the invention containing both the organic sulfonate rust inhibitor and the load carrying additive showed remarkably long fatigue life as expressed by 20 x 106 times or more.
- In contrast to this, the lubricant compositions of Comparative Examples 1 to 9, containing either the organic sulfonate rust inhibitor or the load carrying additive, or containing none of them exhibited the fatigue life ranging from 3.3 x 106 to 12.7 x 106, indicating far shorter fatigue life as compared with that in Examples.
- The above-mentioned results clearly demonstrate that the fatigue life under an atmosphere of hydrogen can be remarkably extended by the combined use of the organic sulfonate and the load carrying additive, without thickening the oil film.
Claims (7)
- A lubricant composition for use in lubricating steel mechanical members operated by a rolling motion or rolling-sliding motion, comprising a base oil and additives, wherein the additives include an organic sulfonate rust inhibitor and a load carrying additive.
- The lubricant composition of claim 1, wherein the load carrying additive is at least one selected from the group consisting of salts of thiocarbamic acid, salts of thiophosphoric acid, salts of naphthenic acid, salts of carboxylic acid, and organic phosphoric acid esters.
- The lubricant composition of claim 1 or 2, wherein the organic sulfonate rust inhibitor is represented by formula (I):
[R1-SO3]n1M1 (I)
wherein R1 is an alkyl group, alkenyl group, alkylnaphthyl group, dialkylnaphthyl group, alkylphenyl group or a residue of high-boiling petroleum distillate, where the alkyl or alkenyl is a straight-chain or branched alkyl or alkenyl group having 2 to 22 carbon atoms; M1 is an alkali metal, alkaline earth metal, zinc or ammonium ion; and n1 indicates the valence of M1 . - The lubricant composition of any one of claims 1 to 3, further comprising a thickener.
- The lubricant composition of any one of claims I to 4, wherein the mechanical member is a rolling element bearing, gear wheel, ball thread, linear guide, linear motion guide bearing, cam or joint which is operated in an atmosphere of hydrogen.
- The lubricant composition of any one of claims 1 to 4, wherein the mechanical member is a rolling element bearing for use in automobile electrical equipment or auxiliaries thereof.
- A mechanical member containing the lubricant composition of any one of claims 1 to 6.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2008012776A JP5467723B2 (en) | 2008-01-23 | 2008-01-23 | Lubricant composition and machine member |
PCT/JP2009/051067 WO2009093685A1 (en) | 2008-01-23 | 2009-01-23 | Lubricating agent composition and mechanical member |
Publications (3)
Publication Number | Publication Date |
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EP2239313A1 true EP2239313A1 (en) | 2010-10-13 |
EP2239313A4 EP2239313A4 (en) | 2012-03-07 |
EP2239313B1 EP2239313B1 (en) | 2014-07-30 |
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EP09704336.8A Active EP2239313B1 (en) | 2008-01-23 | 2009-01-23 | Use of Lubricating Agent Composition in Mechanical Members |
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---|---|
US (1) | US9528073B2 (en) |
EP (1) | EP2239313B1 (en) |
JP (1) | JP5467723B2 (en) |
KR (1) | KR101245688B1 (en) |
CN (1) | CN101910386A (en) |
WO (1) | WO2009093685A1 (en) |
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EP3666860A1 (en) * | 2018-11-06 | 2020-06-17 | Kyodo Yushi Co., Ltd. | Anti-flaking agent and lubricant composition comprising the same |
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JP2011037975A (en) * | 2009-08-10 | 2011-02-24 | Kyodo Yushi Co Ltd | Grease composition and machine part |
JP5766425B2 (en) * | 2010-10-20 | 2015-08-19 | 協同油脂株式会社 | Grease composition |
JP5774881B2 (en) * | 2011-03-17 | 2015-09-09 | 協同油脂株式会社 | Grease composition |
JP6193619B2 (en) * | 2013-05-22 | 2017-09-06 | Ntn株式会社 | Rolling bearing |
WO2015016376A1 (en) * | 2013-08-02 | 2015-02-05 | 協同油脂株式会社 | Grease composition |
CN103421585A (en) * | 2013-08-23 | 2013-12-04 | 苏州长盛机电有限公司 | Rust-preventive oil of chain |
JP6683484B2 (en) * | 2016-01-22 | 2020-04-22 | シェルルブリカンツジャパン株式会社 | Grease composition |
CN106367174A (en) * | 2016-08-29 | 2017-02-01 | 岳西县日胜商贸有限公司 | Lubricating agent for gear mounting |
JP7166068B2 (en) * | 2018-03-27 | 2022-11-07 | Ntn株式会社 | Grease-filled rolling bearing |
CN111876218B (en) * | 2020-06-19 | 2022-07-19 | 中国石油化工股份有限公司 | Conductive bearing lubricating grease composition and preparation method thereof |
JPWO2022034883A1 (en) * | 2020-08-12 | 2022-02-17 |
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Also Published As
Publication number | Publication date |
---|---|
JP2009173751A (en) | 2009-08-06 |
JP5467723B2 (en) | 2014-04-09 |
WO2009093685A1 (en) | 2009-07-30 |
EP2239313B1 (en) | 2014-07-30 |
CN101910386A (en) | 2010-12-08 |
KR20100093035A (en) | 2010-08-24 |
US9528073B2 (en) | 2016-12-27 |
KR101245688B1 (en) | 2013-03-25 |
US20100298178A1 (en) | 2010-11-25 |
EP2239313A4 (en) | 2012-03-07 |
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